2003 Chevy Silverado lights/electrical

It started with the reverse lights, brakes, and turning signals not working. No reverse lights, and brake and blinkers are dim and alternate when brakes are applied. Only the cab brake light comes on. Blinkers blink fast. Now the service 4wd light just came on. I have no idea if the issues are related.

How about checking the grounds to the rear lights and the sockets,
look for a burn mark usually where the ground wire is connected to
the socket.
Service 4WD light can mean anything from just a drain and refill of
the fluids to a failure in the transfer case itself.

Did you try running a separate ground wire and just slip it in
between the side of the bulb and socket? The only other thing I can
think of is if this has the IC board inside the taillight assemblies but I
didn't think the 03 used them.

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